package com.haotunet.app.goldtreasure.views;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.text.Layout;
import android.text.StaticLayout;
import android.text.TextPaint;
import android.util.AttributeSet;
import android.widget.TextView;

public class MyTextView extends TextView{
	 private int mLineY;        
     private int mViewWidth;        
     public static final String TWO_CHINESE_BLANK = "  ";
     
     public MyTextView(Context context, AttributeSet attrs) {        
             super(context, attrs);
             }        
     @Override        
     protected void onLayout(boolean changed, int left, int top, int right,int bottom){        
             super.onLayout(changed, left, top, right, bottom);        
             }        
     @Override        protected void onDraw(Canvas canvas) {                
             TextPaint paint = getPaint();                
             paint.setColor(getCurrentTextColor());        
             paint.drawableState = getDrawableState();        
             mViewWidth = getMeasuredWidth();                
             String text = getText().toString();                
             mLineY = 0;                
             mLineY += getTextSize();        
             Layout layout = getLayout();        
             
             if (layout == null) {
                     return;                
                     }                
             Paint.FontMetrics fm = paint.getFontMetrics();                
             int textHeight = (int) (Math.ceil(fm.descent - fm.ascent));                
             textHeight = (int) (textHeight * layout.getSpacingMultiplier() + layout.getSpacingAdd());        
             for (int i = 0; i < layout.getLineCount(); i++) {                
             int lineStart = layout.getLineStart(i);                
             int lineEnd = layout.getLineEnd(i);                        
             float width = StaticLayout.getDesiredWidth(text, lineStart,                
                             lineEnd, getPaint());                        
             String line = text.substring(lineStart, lineEnd);                
             if(i < layout.getLineCount() - 1) {                        
                     if (needScale(line)) {                                
                             drawScaledText(canvas, lineStart, line, width);                
                             } else {                        
                                     canvas.drawText(line, 0, mLineY, paint);                
                                     }                
                     } else {                
                             canvas.drawText(line, 0, mLineY, paint);
                             }                        mLineY += textHeight;
                             }
             }        
     private void drawScaledText(Canvas canvas, int lineStart, String line,float lineWidth) {        
             float x = 0;                
             if (isFirstLineOfParagraph(lineStart, line)) {        
                     String blanks = "  ";        
                     canvas.drawText(blanks, x, mLineY, getPaint());        
                     float bw = StaticLayout.getDesiredWidth(blanks, getPaint());        
                     x += bw;                
                     line = line.substring(3);        
                     }        
             int gapCount = line.length() - 1;        
             int i = 0;                
             if (line.length() > 2 && line.charAt(0) == 12288        
                             && line.charAt(1) == 12288) {        
                     String substring = line.substring(0, 2);        
                     float cw = StaticLayout.getDesiredWidth(substring, getPaint());        
                     canvas.drawText(substring, x, mLineY, getPaint());        
                     x += cw;                
                     i += 2;                
                     }                
             float d = (mViewWidth - lineWidth) / gapCount;                
             for (; i < line.length(); i++) {                
                     String c = String.valueOf(line.charAt(i));        
                     float cw = StaticLayout.getDesiredWidth(c, getPaint());                
                     canvas.drawText(c, x, mLineY, getPaint());                        
                     x += cw + d;                
                     }        
             }        
     
     private boolean isFirstLineOfParagraph(int lineStart, String line) {        
             return line.length() > 3 && line.charAt(0) == ' '                
                             && line.charAt(1) == ' ';        
             }
     
     private boolean needScale(String line) {        
             if (line == null || line.length() == 0) {        
                     return false;                
             } else {                
                     return line.charAt(line.length() - 1) != '\n';                
                     }        
             }
     
}
